Pair furnace



Jan. 13; 1931. w. lsAAcs ET AL 1,788,796

PAIR FURNACE Filed Oct. 11, 1928 x H T TORNEYJ Val or opening on eachside of the lower chamher and extending for a short distance into Y theupper chamber are disposed a plurality grooved out on their upper facesso that eac f ll longitudinally aligned series of blocks will serve assupports for one of the superjacent,

preferably cylindrical skids 17 which eX- tend entirely through thefurnace and project for any suitabledistance fromits opposite ends,these skids serving to support the ma.- terial', generally designated asM, duringits passage through the furnace. The bridge walls 12 and 13 may.also be suitablygrooved for the reception of the skids which arepreferably downwardly inclined from the front end toward the rear end ofthe furnace to facilitate the passage ofthe material therethrough andare thus oppositely inclined to the roof It will thus be'apparentthat between each adjacent pair "of skid blocks an opening 18 isprovidedthrough which free circulation of gases can take place between the upperand lower chambers or vice versa beneath the skids while, additionally,as the upper end of the lower chamber-is open between the adjacent endsof the bridge walls,

vided. with a door opening 22-closed by a re the heat from said chambercan directly in pingeon the under surface of the material supported onthe super acent skids.

q The front wall3 of the furnace is provided with a door opening 20closed by a removable door 21 and the rear. end wall similarlypromovable door 23 so that by opening the door 21 materialcan be pushedinto the furnace through the adjacent door opening and along theinclined skids and, after it is heated, may

V be removed with equal facility through the door openingin the rearwallwhen-door 23 is open. Another door opening 24: closed by an auxiliarydoor 25 may be providedin one of the sidewalls to permit convenientaccess to the interior of the furnace for cleaning or repairs. r

Gases for heating the furnace are introduced into theupper chamber froma plurality of ports connected with burners 31 and arranged in the endwall 3 just belowthe roof 5, and to the lower chamber through a port 32near the base of theend wall 3. and

connected with aburner 33. Desirably a plurality of the upper burnersmay be utilized, three'being' -indicated in the drawing,

so as to effectively distribute the heat throughout the realtively wideupper diamber although but a single burn-erli's ordinarily suflicientfor heating the lower chamber because of its relatively restrictedcapacity.

The burners may be of any. suitable type adapted to handle theparticular kind of 'gas enema which to be burned and their specificconstruction therefore forms no part of the present invention, but ofcourse suitable means .are provided for regulating the flow of air andgasesthrough the burners aiidconsequent volume of heat deliveredthereby, so that a substantially exact control of the heating effect inboth theupper and lower' heat chambers may be obtained. v

" The manner of operating 'afurnace constriicted zsubstantially as1.described will be apparent from the foregoing withoutextended-explanation as it will be obvious that g the material to beheated is simply pushed into'the furnace through the front door andalong 'the skids until it either rests between the adjacent inner endsof the bridge walls or overlaps one or both of theni'for a shortdistance. The doors are now closed and the heating gases projected intoboth chambers of the furnace with the result that the material issubjected to substantially uniform heating throughout-a-s the gases arefree to circulate around it in substantially all direc tions. Thematerial having been heated to the desired degree the gases'may beshutoff and thematerial thenremoved from the furof scale formation insubsequent work on the material is avoided while, as stated, because ofthe uniformity with which the material is heated, the subsequent rollingor'otheroperations are facilitated and the breaking of the rolls orother damage to the rolling mills which frequently occurs during thepassage therethrough of non-uniformly heated" material is avoided.Furnaces constructed iiraccordaiice with our inventiona're lessexpensive to install than the-ordinary types of furnace for heatingsimilar materialsbecause of the elimination of the cost of the usualstack, are of relatively long life and readily lend themselves to minorrepairs when necessary so that our invention, apart from its otheradvantages, provides a furnace of commercially practical form well'adapted for use and maintenance undercon-; ditions to which furnaces forheating this "class of materialare ordinarily subjected. In I sire orintend to limit or confine ourselves thereto, as changes andmodifications may be.

- claim and desireto protect by Letters Patent mad-e in minorparticulars and/orstructural details without departing from the spir tand scope of the invention as defined in the ap-J pended claims.

Having thus'described our invention, we

of the United-States:

I means for suportingthe skids comprising a: plurality of longitudinallyspaced blocks prising transversely spaced longitudinally walls andbeneath theroof and with a similarly closed lower heat chamber disposedbeneath' and of less width than the upperjchamv ber and -communicatingtherewith for aportion of its length, means for directing a gaseousheatlng medium into the u per chamber through one wall thereof a jacentthe roof, means for directing asimilar medium into the lower chamberthrough said wall, spaced skids adapted to support material ,to

x be heated extending longitudinally through the furnace anddisposedinthe upper chamber on opposite sides of the lowerchamber,

dispo'sedvbeneath the central portions of the skids and forming betweenthem a plurality of passages for the free circulation of gases 3A-furnaceof the classdescribed,ha'ving longitudinally extendingtransversely spaced sidewalls, longitudinally spaced transverselyextending-front and rear walls and a roofextending between all of saidwalls, and comprising anlupperheat chamber and a lower heat chamber ofless width than the, upper chamber and centrally disposedtherebelow,

bridge w ns; extending between the: upper and" lower-chambers adjacentthe frontland rear-walls of theifurnace but longitudinally spaced apartat theirinner extremities to afg ford'coinmumcation between saidchambers,

means for directing a gaseous heating n ie-' of thefurnace, means fordirecting a simllar is dium-into theupper ch'amberthrough a-wall mediuminto thelowerchamber through said wall, longitudinally disposed skidsextending through the 'furnace and downwardly ink clined from the frontto the rear wall thereof and arranged on opposite'sides of the lowerchamber and within the upperchamber, and

a series, of longitudinally spaced blocks; adapted to support said skidsbetween'said V bridge walls wherebya plurality of openings are, providedbetweentheblocks to facilitate the circulation of the gases between thechamhers and about the material to be heated when resting'on the skids.7 V In: witness whereof we have hereunto set ourhandsthis 9th day ofOctober, 1928.

. -WILLIAM ISAAGS;

ELMEREL MoVEYi from one chamber to the other adjacent said centralportions ofthe skids, and meansadjacent the end walls of the furnace forpreventing such circulation. ,7

2. A furnace of the class described, comextending side walls,longitudinally spaced transversely extending end walls and aroofextending between said walls and, inclined v toward the front end of thefurnace, said furnace having an upper heat chamber ex- 7 tendingbetween'the side and end walls and beneath the roof and with a lowerheat chan1- ber disposed beneath and of less width than the upperchamber and communicating i therewith for a portionof its length, meansfordirecting a gaseous heating medium intothe upper chamber through onewall thereof adj acent'the roof, means for directinga similar med uminto the lower chamber through 1 said wall, spacedv skids adapted to;support material to be heated extending longitudi- I nally throughthefurnace and disposed in the r upper chamber on opposite sides of thelower chamber, means. for supporting the skids comprising a, plurality.of longitudinally spaced'blocks disposed adjacent the juncture j of thetwo chambers and a bridge wall j separating the upper and lower chambersadjafi cent each end wall of the furnace.

